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Match the following lists and select the correct answer
List-I List-II
A $1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6}, 4 s^{1}$ 1 d-block element
B $1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6}$ 2 Halogen
C $1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6} 3 d^{6}, 4 s^{2}$ 3 Alkali metal
D $1 s^{2}, 2 s^{2} 2 p^{5}$ 4 Noble gas

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A - 1, B - 2, C - 3, D - 4

A - 3, B - 4, C - 1, D - 2

A - 1, B - 3, C - 2, D - 4

A - 2, B - 4, C - 3, D - 1

answer is B.

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Detailed Solution

The general form for the electron configuration of each alkali metal is ns¹

The halogens all have the general electron configuration ns²np⁵

All of the noble gases have outer energy level electron configurations that are the same, ns²np⁶

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